John Rawls never published anything about his own religious beliefs, but after his death two texts were discovered which shed extraordinary light on the subject. A Brief Inquiry into the Meaning of Sin and Faith is Rawls's undergraduate senior thesis, submitted in December 1942, just before he entered the army. The present volume includes these two texts, together with an Introduction by Joshua Cohen and Thomas Nagel, which discusses their relation to Rawls's published work, and an essay by Robert Merrihew Adams, which places the thesis in its theological context.